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• Using type passed as a template in C++

  - by MeDiCS

  Is it possible to actually use the type passed as a template for control flow? I'd like to write a function that uses templates, which in turn calls another function based on the type passed: template <class T> void test_function (T var) { //Do stuff if (T == char) { bar (var); } else { foo (var); } //Do even more stuff } If not, I'll have to fallback to enums...

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• Why when I try to instantiate a class instance, do I get StackOverFlowException?

  - by flockofcode

  I keep getting StackOverFlowException whenever I instantiate an instance of A class. I know it has got something to do with the fact that A.b field is of type derived from class A. But why would that cause an exception? static void Main(string[] args) { A a = new A(); // exception } class A { private B b = new B(); } class B:A {} thank you

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• Create a custom button

  - by Beppi Menozzi

  Sorry if this is too basic. I created a new class that extends Button: public class MyButton extends Button { private Context ctx; public MyButton(Context context) { super(context); ctx = context; } private void click() { // DO WHAT I NEED (FOR EXAMPLE CHANGE BACKGROUND) } } How can make it possible that, when I setOnClickListener() from another class where I instantiated this object, the click() method is called automatically? Thanks.

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• How to templatize the container type in a function declaration?

  - by Kyle

  I want to write a function that accepts any container holding strings. Something like this: template <typename Container> void foo(Container<string>& stuff); But this isn't the right syntax. What's the right syntax?

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• Error while debug (role redirection)

  - by Chris White

  What is wrong with my role redirection, protected void Login1_LoggedIn(object sender, EventArgs e) { { if (Roles.IsUserInRole(Login1.UserName, "Aemy")) Response.Redirect("~/Admin/Home.aspx"); else if (Roles.IsUserInRole(Login1.UserName, "User")) Response.Redirect("~/Welcome/User1.aspx"); } } Error : The name 'Roles' does not exist in the current context

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• C++ Template Usage

  - by MalcomTucker

  If I have a template definition like the one below, can someone provide a code sample for how I would actually instantiate an instance of this with two of my own classes? template <class T1, class T2> class LookUpTable { public: LookUpTable(); void set(Tl x, T2* y); T2* get(Tl x); }; Thanks.

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• Formulate POST request in curl

  - by user1867256

  I'm using curl to send POST request to web service http ://localhost 2325//Service How can I desirialize body of the POST request into a variable which I could then access within my POST method ? Can someone give me an example? This is my method [WebInvoke(RequestFormat = WebMessageFormat.Json, UriTemplate = "/user", Method = "POST")] public void Create(User us) Class User contains user_id and user_name. Can anyone please help? All I need is an example how to formulate POST request in curl Thanks

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• Tricky C++ interview question

  - by Rajendra

  Given class A { public: void fun() { std::cout << "fun" << std::endl; } }; A* a = NULL; a->fun(); What will happen and why?

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• Why are interfaces unusable in PHP?

  - by streetparade

  I mean an interface definition without defining the return type makes it unusable? This makes more Clear Interface run { public function getInteger(); } class MyString implements run { public function myNumber() { } public function getInteger() { return "Not a number"; } } In Java every Interface has a return type like Integer,String,Void I know that PHP is unfortunately a loosly typed Language but isnt there a Solution for that Problem? Is it Possible to defining a Interface with a Return type like Integer?

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• [C#] Get Index of Control in an Control-Array

  - by Cocaine112358

  I have a TextBox Array private TextBox[,] Fields = new TextBox[9, 9]; and all the TextBoxes have got the same TextChanged-Event void Field_Changed( object sender, EventArgs e ) Is there a way to get the Index of the sender in the Array (without giving each TextBox it's own EventHandler)?

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• Please suggest what is wrong with this string reversal fucntion(C++)?

  - by AKS

  This code is compiling clean. But when I run this, it gives exception "Access violation writing location" at line 9. void reverse(char *word) { int len = strlen(word); len = len-1; char * temp= word; int i =0; while (len >=0) { word[i] = temp[len-1]; //line9 ++i;--len; } word[i] = '\0'; }

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• Trouble with wstringstream

  - by Rosarch

  I have a wstringstream: wstringstream sstream; AlterSstream(sstream); sstream << "foo"; MessageBoxW( NULL, sstream.str().c_str(), L"subject", MB_OK ); This outputs a long string that looks nothing like what I put in it in AlterSstream(): 00000000002CEC58foo AlterSstream: void AlterSstream(wstringstream& outStream) { outStream << "odp"; } Why is this happening?

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• Weird initialization in C

  - by pacopepe

  Hi there, I have this piece of code and i don't know how it works #include <stdio.h> int main(void) { int numero = ({const int i = 10; i+10;}); printf("%d\n", numero); // Prints 20 return 0; } Why if i delete the second part (i+10;), the compiler gets an error? Why are the brackets necessary? Thank you ^^!

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• Why doesn't this inner class compile?

  - by Vincenzo

  This is my code: #include <algorithm> class A { void f() { struct CompareMe { bool operator() (int i, int j) { return i < j; } } comp; int a[] = {1, 2, 3, 4}; int found = std::min_element(a[0], a[3], comp); } } Error message: no matching function for call to ‘min_element(int&, int&, A::f()::CompareMe&) What am I doing wrong?

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• Getting OperationName in RequestInterceptor

  - by zak

  I have implemented a custom requestor interceptor for the purpose of authenticating requests, similar to below. I am trying to get the operation name in ProcessRequest and unable to. Can anyone let me know how do I get the operation name here? public class SampleInterceptor: Microsoft.ServiceModel.Web.RequestInterceptor { public SampleInterceptor() : base(true) { } public override void ProcessRequest(ref System.ServiceModel.Channels.RequestContext requestContext) { //need the operation name here to authenticate } }

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• Question about Null vs zero

  - by Mike

  I have this function: void ToUpper(char * S) { while (*S!=0) { *S=(*S >= 'a' && *S <= 'z')?(*S-'a'+'A'):*S; S++; } } What does it mean for *S != 0, should it be null instead?

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• UInavigationcontroller

  - by sudhakarilla

  Hello, I have a problem... In my navigationcontroller. i have not working navigationcontroller.its breakof setTitle doesnot follow and doesnot display of Title. -(void)viewDidLoad{ [self.setTitle=@"tableview"]; } Please help in this issue.

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• Alert box not being called upon button click

  - by user279521

  I have a fairly simple code, a button click event, with the first line being a message box. When the button is clicked, the messagebox is not called. protected void btnSubmitToCRM_Click(object sender, EventArgs e) { ClientScript.RegisterStartupScript(GetType(), "alert", "alert('btnSubmitToCRM_Click - 1');", true); if (!ValidateCoreValue()) { ClientScript.RegisterStartupScript(GetType(), "alert", "alert('btnSubmitToCRM_Click - 1 - False');", true); return; } } Any ideas?

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• please tell me how i can paint the whole screen in a rimlet?

  - by user188391

  i am developing a blackberry app. i want to paint the screen. i have implemented this VerticalFieldManager hfmBg = new VerticalFieldManager(Field.USE_ALL_HEIGHT ) { protected void paint(Graphics g) { g.setBackgroundColor(Color.SILVER); g.clear(); super.paint(g); }//end of paint method };//end of vertical field manager but tell me is there any other approach to paint the whole screen?

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• how use in it in main project?

  - by davit-datuashvili

  I have the following interface: public interface MyFunctor { int myFunction(int x); } And I created a class which implements this interface : public class Myfunction1 implements MyFunctor { } how use in main project? i have corrected mistake now i need how run it in main project? i mean in public static void main(String[]args)?

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• Multiple key presses doing different events in C#

  - by Nevik Eeirnb

  Hi, private void Form1_KeyDown(object sender, KeyEventArgs e) { if (e.KeyCode == Keys.W) player1.moveUp(); if (e.KeyCode == Keys.NumPad8) player2.moveUp(); } In the above code the moveUp methods basically just increment a value. I want it so both keys can be pressed (or held down)at the same time and both events will trigger. Thanks, Nevik

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• Representing a number in a byte array (java programming)

  - by Mark Roberts

  I'm trying to represent the port number 9876 (or 0x2694 in hex) in a two byte array: class foo { public static void main (String args[]) { byte[] sendData = new byte[1]; sendData[0] = 0x26; sendData[1] = 0x94; } } But I get a warning about possible loss of precision: foo.java:5: possible loss of precision found : int required: byte sendData[1] = 0x94; ^ 1 error How can I represent the number 9876 in a two byte array without losing precision?

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• How should onClick Listener by defined and instantiated for an Activity

  - by Code Droid

  My Activity has multiple lists so I have defined MyClickListener as below: My question is how I should instantiate this class: MyClickListener mMyClickListener = new MyClickListener(); Or maybe it is better to instantiate inside the onCreate(Bundle) and just define above. Whats considered the better way? I don't want too much in onCreate() its already full of stuff. Any thoughts on the declaration and instatiation? Whats the best way? private class MyClickListener implements OnClickListener { @Override public void onClick(View view) { } }

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• out of follwoing code after error free

  - by asdf

  Public Class A { public A() { system.out.println("con call"); } static { system.out.println("static call"); } { system.out.println("ins call"); } Public static void main(string[] args) { new A(); new A(); }

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• expected identifier before ‘(’

  - by gcc

  stored_name_t scan_construct_struct(void) { stored_name_t stn; int i=0; scanf("%c %lf %lf",&(stn.name) ,&(stn.(the_lower_limit)) ,&(stn.(the_upper_limit))); for(i=0; (scanf("%s", stn.(numbers[i])))!=0; ++i) ; return stn; } dene.c:37: error: expected identifier before ‘(’ token and there is an one more error but I cannot see

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